sounds like a whole bunch of work for various legal firms and expert witnesses.
Possibly, possibly not.
it's not hard to see this case failing the CPS code test, whatever the outcomes of all the various investigative agencies.
https://www.cps.gov.uk/publications/.../codetest.html
Given that whatever regulatory fallout from this accident is going to happen in any event and the pilot is hardly an ongoing threat to the public, I'm struggling to see a a public interest motive for prosecution, let alone the inevitable and formidable evidential challenges.
Not sure this is destined for criminal court...but what do I know?